41% of the moon is not visible from earth at any time.
103
Sound doesn't travel in space.
255
The sun puts out more power in 1 second than mankind has ever used within human existence.
14
Earth is the only planet in our solar system that's not named after a god or goddess.
17
If two pieces of metal touch in space, they become permanently stuck together.
808
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
Jupiter's moon Ganymede, is larger than the planet Mercury!
149